GitHub PR Review MCP Server

An MCP server that gives any LLM client the ability to list, read, review, and comment on GitHub pull requests — turning your AI assistant into a fully capable code reviewer.

Overview

This server wraps the GitHub REST API using FastMCP, exposing pull request operations as tools any MCP-compatible client can call. Connect it to Claude Desktop and you can ask Claude to review your open PRs, read diffs, post inline comments, approve, or request changes — all without leaving your conversation.

The server maintains a single authenticated httpx client across its lifetime, initialised on startup and shared across all tool calls via FastMCP's lifespan context.

Related MCP server: PR Review MCP Server

Tools

Note: approve_pr and request_changes require the authenticated user to be different from the PR author. GitHub does not permit self-review.

Project Structure

github-pr-mcp/
├── server.py          # FastMCP instance, lifespan, tool registration
├── config.py          # Environment variables and constants
├── tools/
│   ├── __init__.py
│   ├── prs.py         # list_open_prs, get_pr_diff
│   └── reviews.py     # get_pr_comments, post_review_comment, approve_pr, request_changes
├── .env               # Your secrets (never committed)
├── .env.example       # Template
├── requirements.txt
├── Dockerfile
└── README.md

Requirements

• Python 3.11+

• uv

• A GitHub Personal Access Token with repo scope

Setup

1. Clone the repository:

git clone https://github.com/Festuskipkoech/github-pr-mcp.git
cd github-pr-mcp

2. Install dependencies:

uv sync

3. Configure your environment:

cp .env.example .env

Edit .env and fill in your values:

GITHUB_TOKEN=your_personal_access_token
GITHUB_OWNER=your_github_username
GITHUB_REPO=your_repository_name

Generate a token at GitHub Settings → Developer Settings → Personal Access Tokens. Enable full repo scope for read and write access.

Running Locally

uv run python server.py

Or with the FastMCP CLI on Streamable HTTP transport:

fastmcp run server.py:mcp --transport streamable-http

Testing with MCP Inspector

Start the server in one terminal:

fastmcp run server.py:mcp --transport streamable-http

Launch the Inspector in a second terminal:

npx -y @modelcontextprotocol/inspector

In the Inspector UI:

• Transport: Streamable HTTP

• URL: http://127.0.0.1:8000/mcp

• Click Connect

Recommended test sequence:

Using with Claude Desktop

Add the following to ~/.config/Claude/claude_desktop_config.json:

{
  "mcpServers": {
    "github-pr-review": {
      "command": "/home/your-user/.local/bin/uv",
      "args": [
        "run",
        "--directory",
        "/absolute/path/to/github-pr-mcp",
        "python",
        "server.py"
      ]
    }
  }
}

Use the full path to uv (find it with which uv). Credentials are read from the .env file automatically — no need to pass them in the config.

Restart Claude Desktop, then try:

List all open pull requests in my repo and show me the diff for PR number 1

Claude calls list_open_prs and get_pr_diff and returns structured results:

Full PR diff and file changes returned inline:

Running with Docker

docker build -t github-pr-mcp .
docker run --env-file .env -p 8000:8000 github-pr-mcp

For Streamable HTTP transport, update server.py to run with:

mcp.run(transport="streamable-http", host="0.0.0.0", port=8000)

Troubleshooting